Daniel Lee / Mbed OS mbed-os-example-cellular-TPB23

This is an example based on mbed-os cellular APIs that demonstrates a TCP or UDP echo transaction with a public echo server. Included TPB23 NB-IoT module which is can use LGU+ in Korea.

This example is showing how to use the NB-IoT(SECOM TPB23 module) of LGU plus network in Korea. The NB-IoT module' seller provided a document on how to start based on Mbed OS 5.11. (Created by CodeZoo) This guide has been supported to the latest os version which included 5.12 ~ 5.15.

  • if you need specific version of Mbed OS, please revision of TPB23_Driver and check it out.
  • Pelion ready example code is here!

Requirement

462 320 320

320

Tested with

1. Import the application into your desktop 

mbed import http://os.mbed.com/users/Daniel_Lee/code/mbed-os-example-cellular-TPB23/

cd mbed-os-example-cellular-TPB23

2. Compile and program 

mbed compile -t <toolchain> -m <TARGET_BOARD>

(supported toolchains : GCC_ARM / ARM / IAR)

3. Download binary to a target board

4. Result 

mbed-os-example-cellular


Built: Aug  7 2019, 06:10:47


[MAIN], plmn: NULL
Establishing connection
[00000001ms][INFO][CELL]: New CellularContext  (20000a08)
[00000002ms][INFO][CELL]: CellularContext plmn NULL
[00000003ms][INFO][CELL]: CellularContext connect
[00000036ms][INFO][CELL]: RSSI -69 dBm
[00000036ms][INFO][CELL]: Start connecting (timeout 1 s)
[00000087ms][INFO][CELL]: RSSI -69 dBm
[00000116ms][INFO][CELL]: Modem ready
[00000146ms][INFO][CELL]: RSSI -69 dBm
[00000146ms][INFO][CELL]: Setup SIM (timeout 1 s)
[00001233ms][INFO][CELL]: Looked up APN internet
[00001362ms][ERR ][CELL]: AT error code 50
[00001362ms][WARN][CELL]: Packet domain event reporting set failed!
[00001393ms][INFO][CELL]: RSSI -65 dBm
[00001393ms][INFO][CELL]: Network registration (timeout 180 s)
[00001443ms][INFO][CELL]: Registering network => Attaching network
[00001473ms][INFO][CELL]: RSSI -65 dBm
[00001473ms][INFO][CELL]: Attaching network (timeout 60 s)
[00001601ms][INFO][CELL]: Found PDP context 1
[00001649ms][INFO][CELL]: Activate PDP context 1


Connection Established.
[00001671ms][INFO][CELL]: Socket 0 open
[00001707ms][INFO][CELL]: Socket 1 open
[00001748ms][INFO][CELL]: Socket create id: 1
[00001883ms][INFO][CELL]: Socket 1 sent 43 bytes to 8.8.8.8 port 53
[00004311ms][INFO][CELL]: Socket 1 recv 59 bytes from 8.8.8.8 port 53
[00004331ms][INFO][CELL]: Close socket: 1 error: 0
[00004331ms][INFO][CELL]: Socket 1 closed
[00004373ms][INFO][CELL]: Socket create id: 1
TCP: connected with echo.mbedcloudtesting.com server
[00004448ms][INFO][CELL]: Socket 0 sent 4 bytes to 52.215.34.155 port 7
TCP: Sent 4 Bytes to echo.mbedcloudtesting.com
[00007560ms][INFO][CELL]: Socket 0 recv 4 bytes
[00007580ms][INFO][CELL]: Close socket: 1 error: 0
[00007580ms][INFO][CELL]: Socket 0 closed
Received from echo server 4 Bytes
[00007581ms][INFO][CELL]: CellularContext disconnect()
[00007630ms][INFO][CELL]: cb: CellularContext disconnected


Success. Exiting

Diff: main.cpp

Revision:
40:c46ee5b71843
Parent:
36:6294a71c9e9e
Child:
42:cab443dff75e
--- a/main.cpp	Tue Apr 30 11:02:03 2019 +0100
+++ b/main.cpp	Mon May 06 09:02:01 2019 +0100
@@ -16,11 +16,14 @@
 
 #include "mbed.h"
 #include "common_functions.h"
+#include "CellularNonIPSocket.h"
+#include "CellularDevice.h"
 #include "UDPSocket.h"
 #include "CellularLog.h"
 
 #define UDP 0
 #define TCP 1
+#define NONIP 2
 
 // Number of retries /
 #define RETRY_COUNT 3
@@ -129,28 +132,59 @@
 }
 
 /**
- * Opens a UDP or a TCP socket with the given echo server and performs an echo
- * transaction retrieving current.
+ * Opens:
+ * - UDP or TCP socket with the given echo server and performs an echo
+ *   transaction retrieving current.
+ * - Cellular Non-IP socket for which the data delivery path is decided
+ *   by network's control plane CIoT optimisation setup, for the given APN.
  */
 nsapi_error_t test_send_recv()
 {
     nsapi_size_or_error_t retcode;
 #if MBED_CONF_APP_SOCK_TYPE == TCP
     TCPSocket sock;
-#else
+#elif MBED_CONF_APP_SOCK_TYPE == UDP
     UDPSocket sock;
+#elif MBED_CONF_APP_SOCK_TYPE == NONIP
+    CellularNonIPSocket sock;
 #endif
 
+#if MBED_CONF_APP_SOCK_TYPE == NONIP
+    retcode = sock.open((CellularContext*)iface);
+#else
     retcode = sock.open(iface);
+#endif
+
     if (retcode != NSAPI_ERROR_OK) {
 #if MBED_CONF_APP_SOCK_TYPE == TCP
         print_function("TCPSocket.open() fails, code: %d\n", retcode);
-#else
+#elif MBED_CONF_APP_SOCK_TYPE == UDP
         print_function("UDPSocket.open() fails, code: %d\n", retcode);
+#elif MBED_CONF_APP_SOCK_TYPE == NONIP
+        print_function("CellularNonIPSocket.open() fails, code: %d\n", retcode);
 #endif
         return -1;
     }
 
+    int n = 0;
+    const char *echo_string = "TEST";
+    char recv_buf[4];
+
+    sock.set_timeout(15000);
+
+#if MBED_CONF_APP_SOCK_TYPE == NONIP
+    retcode = sock.send((void*) echo_string, sizeof(echo_string));
+    if (retcode < 0) {
+        print_function("CellularNonIPSocket.send() fails, code: %d\n", retcode);
+        return -1;
+    } else {
+        print_function("CellularNonIPSocket: Sent %d Bytes\n", retcode);
+    }
+
+    n = sock.recv((void*) recv_buf, sizeof(recv_buf));
+
+#else
+
     SocketAddress sock_addr;
     retcode = iface->gethostbyname(host_name, &sock_addr);
     if (retcode != NSAPI_ERROR_OK) {
@@ -160,10 +194,6 @@
 
     sock_addr.set_port(port);
 
-    sock.set_timeout(15000);
-    int n = 0;
-    const char *echo_string = "TEST";
-    char recv_buf[4];
 #if MBED_CONF_APP_SOCK_TYPE == TCP
     retcode = sock.connect(sock_addr);
     if (retcode < 0) {
@@ -193,6 +223,7 @@
 
     n = sock.recvfrom(&sock_addr, (void*) recv_buf, sizeof(recv_buf));
 #endif
+#endif
 
     sock.close();
 
@@ -219,10 +250,17 @@
     dot_thread.start(dot_event);
 #endif // #if MBED_CONF_MBED_TRACE_ENABLE
 
-    // sim pin, apn, credentials and possible plmn are taken atuomtically from json when using get_default_instance()
-    iface = NetworkInterface::get_default_instance();
+#if MBED_CONF_APP_SOCK_TYPE == NONIP
+    iface = CellularContext::get_default_nonip_instance();
+#else
+    iface = CellularContext::get_default_instance();
+#endif
+
     MBED_ASSERT(iface);
 
+    // sim pin, apn, credentials and possible plmn are taken automatically from json when using NetworkInterface::set_default_parameters()
+    iface->set_default_parameters();
+
     nsapi_error_t retcode = NSAPI_ERROR_NO_CONNECTION;
 
     /* Attempt to connect to a cellular network */